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/*
* Copyright © 2023 Michael Smith <mikesmiffy128@gmail.com>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED “AS IS” AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
* OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*/
/* Unix-specific definitions for os.h - don't include this directly! */
#ifdef __GNUC__
#define EXPORT __attribute__((visibility("default")))
#else
#define EXPORT int novis[-!!"visibility attribute requires Clang or GCC"];
#endif
#define IMPORT
typedef char os_char;
#define OS_LIT(x) x
#define os_snprintf snprintf
#define os_strchr strchr
#define os_strcmp strcmp
#define os_strcpy strcpy
#define os_strlen strlen
#define os_fopen fopen
#define os_open open
#define os_access access
#define os_stat stat
#define os_mkdir(f) mkdir(f, 0755) // use real mkdir(2) if the mode matters
#define os_unlink unlink
#define os_getenv getenv
#define os_getcwd getcwd
#define OS_DLSUFFIX ".so"
#define OS_MAIN main
#define os_dlsym dlsym
#ifdef __linux__
// note: this is glibc-specific. it shouldn't be used in build-time code, just
// the plugin itself (that really shouldn't be a problem).
static inline int os_dlfile(void *m, char *buf, int sz) {
// private struct hidden behind _GNU_SOURCE. see dlinfo(3) or <link.h>
struct gnu_link_map {
unsigned long l_addr;
const char *l_name;
void *l_ld;
struct gnu_link_map *l_next, *l_prev;
// [more private stuff below]
};
struct gnu_link_map *lm = m;
int ssz = strlen(lm->l_name) + 1;
if (ssz > sz) { errno = ENAMETOOLONG; return -1; }
memcpy(buf, lm->l_name, ssz);
return ssz;
}
#endif
// unix mprot flags are much nicer but cannot be defined in terms of the windows
// ones, so we use the windows ones and define them in terms of the unix ones.
// another victory for stupid!
#define PAGE_NOACCESS 0
#define PAGE_READONLY PROT_READ
#define PAGE_READWRITE PROT_READ | PROT_WRITE
#define PAGE_EXECUTE_READ PROT_READ | PROT_EXEC
#define PAGE_EXECUTE_READWRITE PROT_READ | PROT_WRITE | PROT_EXEC
static inline bool os_mprot(void *addr, int len, int fl) {
// round down address and round up size
addr = (void *)((unsigned long)addr & ~(4095));
len = len + 4095 & ~(4095);
return mprotect(addr, len, fl) != -1;
}
static inline void os_randombytes(void *buf, int sz) {
// if this call fails, the system is doomed, so loop until success and pray.
while (getentropy(buf, sz) == -1);
}
// vi: sw=4 ts=4 noet tw=80 cc=80
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